The site also has files to use in completing an Advance Directive. The files for filling out an Advance Directive in Michigan can be found here.A power of attorney is a document that allows you to give someone the authority to manage your financial affairs. This person is called your agent. Get Power of Attorney for Michigan with comments from a professional lawyer for free and notarize online! A special power of attorney letter grants another person the authority to act on your behalf, so it's essential to ensure that it's properly drafted. Michigan power of attorney forms authorize a representative to make decisions and act on behalf of the principal (the individual being represented). Authorized Representative Declaration (Power of Attorney) Form 151. All Michigan Power of Attorney forms from Rocket Lawyer can be completely personalized for your specific circumstances. The good news is, there are special documents which help prepare someone for this scenario.